- Remove underscores from the internal structure name, as it doesn't collide

  with the user's namespace.

- Correct size and position variables type from long to size_t.

- Do not set errno to ENOMEM on malloc failure, as malloc already does so.

- Implement the concept of "buffer data length", which mandates what SEEK_END
  refers to and the allowed extent for a read.

- Use NULL as read-callback if the buffer is opened in write-only mode.
  Conversely, use NULL as write-callback when opened in read-only mode.

- Implement the handling of the ``b'' character in the mode argument. A binary
  buffer differs from a text buffer (default mode if ``b'' is omitted) in that
  NULL bytes are never appended to writes and that the "buffer data length"
  equals to the size of the buffer.

- Remove shall from the man page. Use indicative instead. Also, specify that
  the ``b'' flag does not conform with POSIX but is supported by glibc.

- Update the regression test so that the ``b'' functionality and the "buffer
  data length" concepts are tested.

- Minor style(9) corrections.

Suggested by:	jilles
Reviewed by:	cognet
Approved by:	cognet

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